Noninflammable

Part of speech: adjective

Definitions

1. A substance is characterized by its resistance to catching fire or sustaining combustion, ensuring safety from igniting under heat sources
2. This designation applies to materials that are inherently safe from burning or ignition, effectively preventing flame propagation
3. A material is described as being incapable of igniting or supporting combustion, which guarantees a lower risk of fire hazard in various applications

Etymology: "Noninflammable" is a plain formation: the prefix "non-," meaning "not," attached to "inflammable." The surprise lies in the second half. "Inflammable" comes from Latin "inflammare," "to set on fire," and English took it up with the sense of "capable of catching fire." The trouble is that the prefix "in-" in "inflammable" was read by many people as the negating "in-" (as in "invisible"), so the word seemed to mean "not flammable." That misreading caused real danger: "inflammable" was dangerously ambiguous, since a reader might take it to mean "safe from fire," and this confusion is why safety campaigns pushed for "flammable" instead. Because "noninflammable" was built on top of that ambiguous word, it inherited the confusion while adding a clear negation. Its meaning is therefore unambiguous in a way "inflammable" was not: it means that a material will not burn.

Synonyms: fireproof, incombustible

Antonyms: flammable, combustible